After clearing an assignment at 1447 hours companies 2 and 3 were dispatched to the Exeter Senior High School for an automatic fire alarm. Crews arrived on the scene to find one sprinkler head activated on the first floor of the school. Reiffton 2-11 requested companies 4 and 5 respond to the scene to assist. Crews cleared the scene at 1604 hours. While clearing the scene companies 4 and 5 handled a carbon monoxide alarm in company 2s local.